¹ Department of Mathematics, Zhejiang University, Hangzhou 310027, China

² Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong

³ State Key Laboratory of Information Security, Graduate School of Chinese Academy of Sciences, Beijing 100049, China

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EURASIP Journal on Advances in Signal Processing 2005, 2005:962703

doi:10.1155/ASP.2005.1277

The electronic version of this article is the complete one and can be found online at: http://http://www.zjjv.com///content/2005/8/962703

Received:23 August 2004 Revisions received:4 January 2005 Published:31 May 2005

© 2005 Li et al.

Recently, a new signal security system called TDCEA (two-dimensional circulation encryption

algorithm) was proposed for real-time multimedia data transmission. This paper gives

a comprehensive analysis on the security of TDCEA. The following security problems

are found: (1) there exist some essential security defects in TDCEA; (2) two known-plaintext

attacks can break TDCEA; (3) the chosen-plaintext and chosen-ciphertext versions of

the aforementioned two known-plaintext attacks can break TDCEA even with a smaller

complexity and a better performance. Some experiments are given to show the security

defects of TDCEA and the feasibility of the proposed known-plaintext attacks. As a

conclusion, TDCEA is not suitable for applications that require a high level of security.

Research Article